Two Businesses, One P&L
You run one company on paper. On the ground you run two, and only one of them shows up honestly in your numbers.
One business bids new construction and large commercial jobs. Big tickets, long timelines, thin margins, cash that arrives in stages and occasionally in arguments. The other answers service calls, handles the panel upgrade and the troubleshoot and the standing maintenance account. Small tickets, fast cash, fatter margins per dollar. Most electrical contractors I've met run both and report them as one blended P&L, which means the most profitable part of the company is the part nobody can actually see.
The margins aren't close. Writers covering electrical bookkeeping through 2025 and 2026 put residential and commercial service work in the 65 to 67 percent gross-margin range, while commercial construction and new-build work often lands between 15 and 25 percent. One license, one set of trucks, one owner, and the economics could not be further apart. Average them together and a strong service month papers over a project that's bleeding, while a profitable job hides a service desk barely breaking even. You can't fix either one, because the report won't tell you which one you have.
What the blended number costs you
The damage runs deeper than not being able to see it. You make real decisions on the average. You chase the big commercial bid because the revenue figure is exciting, and you pull your best licensed hands off service calls to staff it. The bid comes in at a margin your service work would never accept, and the service backlog you left behind was the higher-margin work all along. You didn't decide to trade good money for volume. The P&L just never put that choice in front of you.
Licensed labor is the constraint that makes this expensive. You have only so many journeymen and masters, and industry writers keep pointing out the pipeline is getting tighter, not looser, with a large share of the current workforce nearing retirement and apprenticeships that take 4 to 5 years to season. Every hour of licensed time you spend is a bet. If you can't see that service produces more margin per licensed hour than the marquee project does, you'll keep feeding the project, because the project is louder.
Splitting the two apart
You don't need new software or a 6-month project. You need two P&Ls where you have one.
Give service and construction their own revenue accounts, their own direct labor, their own materials, and their own share of the trucks and overhead. Assign every field hour to one side or the other. Do it for a single quarter and stop guessing. The construction accountants writing on this are blunt: a contractor running service, commercial projects, and new construction is running three financial operations and usually staring at one combined statement that hides which one earns and which one eats.
Then read what falls out. Owners who split the two often find the service department carrying a margin the construction side can't touch, and find it chronically understaffed because the big jobs always won the fight for people. That's not a reason to walk away from construction. Plenty of good businesses are built on lower-margin project work done at scale. It's a reason to know what each type of work actually pays before you decide where the next licensed hour goes.
Run the split this quarter, on last year's numbers if that's the only clean data you have. You're not doing it for the accountant. You're doing it so the next time a large bid and a full service board are fighting over the same four electricians, you make that call with the real margins in front of you instead of a blended average that was never true for either business.